scholarly journals Optimizing the Use of Secchi Depth as a Proxy for Euphotic Depth in Coastal Waters: An Empirical Study from the Baltic Sea

2013 ◽  
Vol 2 (4) ◽  
pp. 1153-1168 ◽  
Author(s):  
Hanna Luhtala ◽  
Harri Tolvanen
Keyword(s):  
Empirical Study ◽  
Baltic Sea ◽  
Coastal Waters ◽  
Secchi Depth ◽  
The Baltic Sea ◽  
Euphotic Depth ◽  
The Baltic

scholarly journals Evaluation of Sentinel-3A OLCI Products Derived Using the Case-2 Regional CoastColour Processor over the Baltic Sea

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3609 ◽  
Author(s):  
Kyryliuk ◽  
Kratzer
Keyword(s):  
Remote Sensing ◽  
Baltic Sea ◽  
Attenuation Coefficient ◽  
Secchi Depth ◽  
Local Algorithm ◽  
The Baltic Sea ◽  
In Situ Data ◽  
The Baltic ◽  
Level 2

In this study, the Level-2 products of the Ocean and Land Colour Instrument (OLCI) data on Sentinel-3A are derived using the Case-2 Regional CoastColour (C2RCC) processor for the SentiNel Application Platform (SNAP) whilst adjusting the specific scatter of Total Suspended Matter (TSM) for the Baltic Sea in order to improve TSM retrieval. The remote sensing product “kd_z90max” (i.e., the depth of the water column from which 90% of the water-leaving irradiance are derived) from C2RCC-SNAP showed a good correlation with in situ Secchi depth (SD). Additionally, a regional in-water algorithm was applied to derive SD from the attenuation coefficient Kd(489) using a local algorithm. Furthermore, a regional in-water relationship between particle scatter and bench turbidity was applied to generate turbidity from the remote sensing product “iop_bpart” (i.e., the scattering coefficient of marine particles at 443 nm). The spectral shape of the remote sensing reflectance (Rrs) data extracted from match-up stations was evaluated against reflectance data measured in situ by a tethered Attenuation Coefficient Sensor (TACCS) radiometer. The L2 products were evaluated against in situ data from several dedicated validation campaigns (2016–2018) in the NW Baltic proper. All derived L2 in-water products were statistically compared to in situ data and the results were also compared to results for MERIS validation from the literature and the current S3 Level-2 Water (L2W) standard processor from EUMETSAT. The Chl-a product showed a substantial improvement (MNB 21%, RMSE 88%, APD 96%, n = 27) compared to concentrations derived from the Medium Resolution Imaging Spectrometer (MERIS), with a strong underestimation of higher values. TSM performed within an error comparable to MERIS data with a mean normalized bias (MNB) 25%, root-mean square error (RMSE) 73%, average absolute percentage difference (APD) 63% n = 23). Coloured Dissolved Organic Matter (CDOM) absorption retrieval has also improved substantially when using the product “iop_adg” (i.e., the sum of organic detritus and Gelbstoff absorption at 443 nm) as a proxy (MNB 8%, RMSE 56%, APD 54%, n = 18). The local SD (MNB 6%, RMSE 62%, APD 60%, n = 35) and turbidity (MNB 3%, RMSE 35%, APD 34%, n = 29) algorithms showed very good agreement with in situ data. We recommend the use of the SNAP C2RCC with regionally adjusted TSM-specific scatter for water product retrieval as well as the regional turbidity algorithm for Baltic Sea monitoring. Besides documenting the evaluation of the C2RCC processor, this paper may also act as a handbook on the validation of Ocean Colour data.

scholarly journals Long-term trends in Secchi depth in the Baltic Sea

1996 ◽  
Vol 41 (2) ◽  
pp. 346-351 ◽  
Author(s):  
Per Sandén ◽  
Bertil Håkansson
Keyword(s):  
Baltic Sea ◽  
Secchi Depth ◽  
The Baltic Sea ◽  
Long Term Trends ◽  
The Baltic

scholarly journals Limited success of the non-indigenous bivalve clam Rangia cuneata in the Lithuanian coastal waters of the Baltic Sea and the Curonian Lagoon

Oceanologia ◽  
2019 ◽  
Vol 61 (3) ◽  
pp. 341-349 ◽  
Author(s):  
Sabina Solovjova ◽  
Aurelija Samuilovienė ◽  
Greta Srėbalienė ◽  
Dan Minchin ◽  
Sergej Olenin
Keyword(s):  
Baltic Sea ◽  
Coastal Waters ◽  
Curonian Lagoon ◽  
The Baltic Sea ◽  
Rangia Cuneata ◽  
Limited Success ◽  
The Baltic

scholarly journals On sediment pollution in selected german coastal waters of the Baltic Sea

Limnologica ◽  
1999 ◽  
Vol 29 (3) ◽  
pp. 255-261 ◽  
Author(s):  
Albrecht Müller ◽  
Peter Heininger
Keyword(s):  
Baltic Sea ◽  
Coastal Waters ◽  
Sediment Pollution ◽  
The Baltic Sea ◽  
The Baltic

Testing relationships between macroalgal cover and Secchi depth in the Baltic Sea

2009 ◽  
Vol 9 (6) ◽  
pp. 1284-1287 ◽  
Author(s):  
Dorte Krause-Jensen ◽  
Jacob Carstensen ◽  
Karsten Dahl ◽  
Saara Bäck ◽  
Samuli Neuvonen
Keyword(s):  
Baltic Sea ◽  
Secchi Depth ◽  
The Baltic Sea ◽  
Macroalgal Cover ◽  
The Baltic
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